Creating slick-looking videos with Vegas

I am relatively new at video production and have no formal training. But I have created a few training videos and have selected Vegas 5 as my platform. I want to increase the complexity of my videos and create effects (compositing etc) like they use on some tv commercials (though probably not quite at the level of Lucas Arts or Pixar etc!)

Can anyone recommend any good books/training videos/websites as a good starting point?